extream flight 44" crop duster

Hi, guys,
I got an extreme flight 44" crop duster a few days ago and have servo questions. EF recommends HS70MG ($30 a piece and 6 of them, totaling $180!!!). This is too expensive for me. This is my first electric plane, and I don't know much about feather micro or micro servos. for an instance, HS53 or HS55 (costing $10 a piece or less) will do the job? for the motor and esc, I'm on the way to order os 10 ($55) and os 50 amp esc ($80, this is expensive side too). I'm trying to be economical in this project. any input is appreciated.
Thanks!